| 1001 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 1002 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 1003 | Solid Rock Prod. | | Oil Operator | Nov 1994 |
| 1004 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 1005 | Source Petroleum Inc. | San Antonio, TX 78265 | Oil & Gas Operator | Feb 2026 |
| 1006 | South Central Petroleum, Inc. | | Oil & Gas Operator | Dec 1988 |
| 1007 | Southern Oil & Gas Company | | Oil & Gas Operator | Mar 2011 |
| 1008 | Southern States Gas & Oil LTD | | Oil & Gas Operator | Jul 2004 |
| 1009 | Southern States Oil Production, LLC | | Oil & Gas Operator | Oct 2013 |
| 1010 | Southwest Operating Inc. | | Oil & Gas Operator | Dec 2024 |
| 1011 | Southwestern Electric Power Co | Dallas, TX 75266 | Oil & Gas Operator | Dec 1989 |
| 1012 | Sovereign Energy Corp. | | Oil Operator | Dec 2001 |
| 1013 | Spicy Daugx Operators Louisiana LLC | | Oil & Gas Operator | Nov 2024 |
| 1014 | Spyglass Oil & Gas LLC | | Oil & Gas Operator | Dec 2024 |
| 1015 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 1016 | Standard Production | | Oil Operator | Oct 1997 |
| 1017 | Star Falcon Oil Co. | | Oil Operator | Feb 1986 |
| 1018 | Stewart Oil Co. | | Oil Operator | Jun 2009 |
| 1019 | Stinhall Corporation | | Oil & Gas Operator | Apr 1989 |
| 1020 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Feb 2026 |
| 1021 | Stroud Operating LLC | | Oil & Gas Operator | Dec 2012 |
| 1022 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Feb 2026 |
| 1023 | Stroud Production LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 1024 | Stuart Oil | | Oil Operator | Jan 2025 |
| 1025 | Studley Resources Corporation | Humble, TX 77347 | Oil & Gas Operator | Dec 1996 |
| 1026 | STZ Petroleum Inc. | Houston, TX 77268 | Oil & Gas Operator | Dec 1997 |
| 1027 | Sugar Oil Company | | Oil & Gas Operator | Feb 2011 |
| 1028 | Sullivan Well Service | | Oil Operator | Mar 2010 |
| 1029 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Feb 2026 |
| 1030 | Summit Gas LLC | | Oil & Gas Operator | Oct 2011 |
| 1031 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Nov 2025 |
| 1032 | Sun Exploration And Production Co | | Oil & Gas Operator | Jan 1990 |
| 1033 | Sundance Energy Corporation | | Oil & Gas Operator | Jan 2025 |
| 1034 | Sunland Production Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 1035 | SWN Production (Louisiana), LLC | | Oil & Gas Operator | Dec 2024 |
| 1036 | T & F Oil Company | | Oil Operator | Jan 2025 |
| 1037 | T & L Oil Production | | Oil Operator | Jan 2025 |
| 1038 | T H Production Co. | | Oil & Gas Operator | Mar 1994 |
| 1039 | T-M Well Service | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2004 |
| 1040 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Dec 2024 |
| 1041 | T-R Oil | Mapleton, KS 66754 | Oil & Gas Operator | May 2018 |
| 1042 | T. And M. Production | Oil City, LA 71061 | Oil & Gas Operator | Feb 2026 |
| 1043 | T. D. Tedder | | Oil Operator | Dec 1991 |
| 1044 | T. J. Lundy | | Oil Operator | Jan 2025 |
| 1045 | T. M. Hopkins | | Oil & Gas Operator | Aug 2007 |
| 1046 | T. N. T. Energy Co. | Belcher, LA 71004 | Oil Operator | May 1991 |
| 1047 | T. W. McGuire & Associates, Inc. | | Oil & Gas Operator | Nov 2018 |
| 1048 | T.B. Lanford Et Al | | Oil Operator | Apr 1987 |
| 1049 | Talco Midstream Assets, LTD. | | Oil Operator | May 2017 |
| 1050 | Talley Resources, Inc. | Houma, LA 70360 | Oil & Gas Operator | Apr 1993 |
| 1051 | TD & Associates, Inc. | | Oil & Gas Operator | Jun 1998 |
| 1052 | TDC Energy Corporation | | Oil & Gas Operator | Dec 2001 |
| 1053 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 1054 | Teal Petroleum Co. | | Oil & Gas Operator | Sep 1978 |
| 1055 | Tellus Operating Group, LLC | | Oil & Gas Operator | Nov 2025 |
| 1056 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Nov 2025 |
| 1057 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 1058 | Tensas Delta Land Company | | Oil & Gas Operator | Apr 2002 |
| 1059 | Terry Development, Inc. | | Oil & Gas Operator | Aug 1992 |
| 1060 | Terry Oil Company LLC | | Oil Operator | Dec 2024 |
| 1061 | Tervita, LLC | | Oil Operator | May 2021 |
| 1062 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Feb 2026 |
| 1063 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 1064 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Feb 2026 |
| 1065 | Texas Eastern Transm. Corp. | | Oil & Gas Operator | Dec 2002 |
| 1066 | Texas General Petroleum Corp | | Oil & Gas Operator | Aug 1984 |
| 1067 | Texeast Operating Co., Inc. | Farmers BRNCH, TX 75234 | Oil Operator | Feb 2026 |
| 1068 | Texla Operating Co | Jonesville, TX 75659 | Oil & Gas Operator | Feb 2026 |
| 1069 | The Hunter Company, Inc. | | Oil & Gas Operator | Sep 1985 |
| 1070 | The Maurice L. Brown Company | | Oil & Gas Operator | Aug 1987 |
| 1071 | Tholl Oil Company | | Oil Operator | Dec 2003 |
| 1072 | Thor Production Co. | | Oil Operator | May 1997 |
| 1073 | Thor-Max Operating, Inc. | Plano, TX 75025 | Oil & Gas Operator | Feb 2026 |
| 1074 | Three "N" One Production | | Oil & Gas Operator | Dec 2011 |
| 1075 | Three Sisters Petroleum, Inc. | Oil City, LA 71061 | Oil & Gas Operator | Jan 2025 |
| 1076 | Tigner Walker | | Oil & Gas Operator | Dec 2021 |
| 1077 | Tigner Walker Et Al | | Oil & Gas Operator | Aug 2000 |
| 1078 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 1079 | Tipperary Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 1080 | Tma Production, LLC | | Oil Operator | Dec 2024 |
| 1081 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Feb 2026 |
| 1082 | Todd Oil Production Co | | Oil Operator | Aug 2001 |
| 1083 | Tolbert & Associates | | Oil Operator | Dec 2024 |
| 1084 | Tolbert Et Al | | Oil Operator | Jun 2000 |
| 1085 | Tolbert Well Service | | Oil Operator | Jan 2025 |
| 1086 | Tom Moore Trustee | | Oil Operator | Apr 1986 |
| 1087 | Tommy A. Paul | | Oil Operator | Oct 2020 |
| 1088 | Topaz Oil Company | Diboll, TX 75941 | Oil & Gas Operator | Apr 1994 |
| 1089 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 1090 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 1091 | Trade & Development Corp | | Oil & Gas Operator | Nov 1996 |
| 1092 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 1093 | Travis E. Duren | | Oil Operator | Jul 1995 |
| 1094 | Tri-State Sales & Production | Rodessa, LA 71069 | Oil & Gas Operator | Dec 2008 |
| 1095 | Triangle Oil Of Hosston | | Oil Operator | Jul 2014 |
| 1096 | Trickle Down Oil, Inc. | | Oil & Gas Operator | Feb 2016 |
| 1097 | Trico Oil & Gas Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Feb 2026 |
| 1098 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 1099 | Triple J Oil Co. | Pampa, TX 79065 | Oil & Gas Operator | Aug 1996 |
| 1100 | Triple L Oil Company | Corpus Chrsti, TX 78469 | Oil & Gas Operator | Jan 1998 |